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  | isbn    = 0-89181-602-X
 
  | isbn    = 0-89181-602-X
 
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The static oil pressure gradient is dependent on oil density. Subsurface density of oil or condensate depends on composition, amount of dissolved gases, temperature, and pressure. Oil or condensate density can be estimated to useful accuracy if stock tank API gravity and solution gas-oil ratio (GOR) are known.<ref name=ch05r15>Schowalter, T., T., 1979, [http://archives.datapages.com/data/bulletns/1977-79/data/pg/0063/0005/0700/0723.htm Mechanics of secondary hydrocarbon migration and entrapment]: AAPG Bulletin, vol. 63, no. 5, p. 723–760. Covers many fluid behavior principles, including pressure, with broad application to petroleum exploration.</ref>
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The static oil pressure gradient is dependent on oil [[density]]. Subsurface density of oil or condensate depends on [[Oil composition|composition]], amount of [[dissolved gas]]es, [[temperature]], and [[pressure]]. [[Oil and condensate analysis|Oil or condensate density]] can be estimated to useful accuracy if stock tank [[API gravity]] and solution [[gas-oil ratio (GOR)]] are known.<ref name=ch05r15>Schowalter, T., T., 1979, [http://archives.datapages.com/data/bulletns/1977-79/data/pg/0063/0005/0700/0723.htm Mechanics of secondary hydrocarbon migration and entrapment]: AAPG Bulletin, vol. 63, no. 5, p. 723–760. Covers many fluid behavior principles, including pressure, with broad application to petroleum exploration.</ref>
    
==Estimating oil pressure gradients==
 
==Estimating oil pressure gradients==
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